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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 225800.0, MPI für Astronomie / Publikationen_mpia
A Hubble Space Telescope census of nuclear star clusters in late-type spiral galaxies. II. Cluster sizes and structural parameter
Authors:Böker, Torsten; Sarzi, Marc; McLaughlin, Dean E.; van der Marel, Roeland P.; Rix, Hans-Walter; Ho, Luis C.; Shields, Joseph C.
Date of Publication (YYYY-MM-DD):2004
Title of Journal:The Astronomical Journal
Start Page:105
End Page:118
Review Status:not specified
Audience:Not Specified
Abstract / Description:We investigate the structural properties of
nuclear star clusters in late-type spiral
galaxies. More specifically, we fit analytical
models to Hubble Space Telescope images of 39
nuclear clusters in order to determine their
effective radii after correction for the
instrumental point-spread function. We use the
results of this analysis to compare the
luminosities and sizes of nuclear star clusters
to those of other ellipsoidal stellar systems,
in particular the Milky Way globular clusters.
Our nuclear clusters have a median effective
radius of re=3.5 pc, with 50% of the
sample falling in the range
2.4pc‚‚lt;=re‚‚lt;=5.0pc. This narrowsize
distribution is statistically indistinguishable
from that of Galactic globular clusters, even
though the nuclear clusters are, on average, 4
mag brighter than the old globular clusters. We
discuss some possible interpretations of this
result. From a comparison of nuclear cluster
luminosities with various properties of their
host galaxies, we confirm that more luminous
galaxies harbor more luminous nuclear clusters.
It remains unclear whether this correlation
mainly reflects the influence of galaxy size,
mass, and/or star formation rate. Since the
brighter galaxies in our sample typically have
stellar disks with a higher central surface
brightness, nuclear cluster luminosity also
correlates with this property of their hosts. On
the other hand, we find no evidence for a
correlation between the presence of a nuclear
star cluster and the presence of a large-scale
stellar bar.
Free Keywords:Galaxies: Nuclei; Galaxies: Spiral; Galaxies: Star Clusters
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Agency, ESTEC, NL-2200 AG Noordwijk,
Netherlands.), AB(University of Oxford, Keble
Road, Oxford OX1 3RH, England.), AC(Space
Telescope Science Institute, 3700 San Martin
Drive, Baltimore, MD 21218.), AD(Space Telescope
Science Institute, 3700 San Martin Drive,
Baltimore, MD 21218.), AE(Max-Planck-Institut
f‚‚uuml;r Astronomie, K‚‚ouml;nigsstuhl 17,
D-69117 Heidelberg, Germany.), AF(Observatories
of the Carnegie Institution of Washington, 813
Santa Barbara Street, Pasadena, CA 91101-1292.),
AG(Department of Physics and Astronomy,
Clippinger Research Laboratories, Ohio
University, 251B, Athens, OH 45701-2979.)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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